bike riding discussion now is it
my 2c
4 years ago when I was in good shape I could do 125 miles (200km) a day. Now that I've put on 40kgs (YES, shame on me) I an still do about 75 miles. 20 miles is a matter of one or two hours straight riding and I'd be appalled if ANY member here (or any adult anywhere) save those with a physical handicap were not able to do that.